I need either UserContent.css or UserChrome.css to redirect all attempts to go to http://www.amazzon.com, whether by keyboard or by link, to go through smile.amazon.com instead. That way, anything I purchase causes a small but proportional donation to be made to my preferred charity.

Can someone tell me how to do this in five or six lines of code in UserContent or UserChrome instead of my having to install yet another add-on?